No line number table entry seems to be generated for the implicit return instruction at the end of a void method. This can result in very confusing behavior for debugger users. For example,

public class Bug1 {
    public static void main(String args[]) {
        if (args.length == 0) {
            System.out.println("No arguments");
        } else {
            System.out.println(args.length + " arguments");
        }
    }
}

From the javap output below, the return statement ends up as part of the second println's line. After stepping through the if-clause, debugger users next land on the println in the else clause.

This bug is similar, but actually worse than, bug 4026577 reported against the old javac.

H:\work>javap -c -l Bug1
Compiled from Bug1.java
public class Bug1 extends java.lang.Object {
    public Bug1();
    public static void main(java.lang.String[]);
}

Method Bug1()
   0 aload_0
   1 invokespecial #1 <Method java.lang.Object()>
   4 return

Line numbers for method Bug1()
   line 1: 0

Local variables for method Bug1()
   Bug1 this pc=0, length=5, slot=0

Method void main(java.lang.String[])
   0 aload_0
   1 arraylength
   2 iconst_0
   3 if_icmpne 17
   6 getstatic #2 <Field java.io.PrintStream out>
   9 ldc #3 <String "No arguments">
  11 invokevirtual #4 <Method void println(java.lang.String)>
  14 goto 43
  17 getstatic #2 <Field java.io.PrintStream out>
  20 new #5 <Class java.lang.StringBuffer>
  23 dup
  24 invokespecial #6 <Method java.lang.StringBuffer()>
  27 aload_0
  28 arraylength
  29 invokevirtual #7 <Method java.lang.StringBuffer append(int)>
  32 ldc #8 <String " arguments">
  34 invokevirtual #9 <Method java.lang.StringBuffer append(java.lang.String)>
  37 invokevirtual #10 <Method java.lang.String toString()>
  40 invokevirtual #4 <Method void println(java.lang.String)>
  43 return

Line numbers for method void main(java.lang.String[])
   line 3: 0
   line 4: 6
   line 6: 17

Local variables for method void main(java.lang.String[])
   java.lang.String[] args pc=0, length=44, slot=0